Why Do Ex-Smokers Really Gain Weight? (It’s Not Extra Calories.)

Why Do Ex-Smokers Really Gain Weight? (It’s Not Extra Calories.)

This photo taken on August 26, 2013, shows a person smoking an electronic cigarette in Paris. French consumer rights organization '60 millions de consommateurs' ('60 million consumers') declared on August 26, 2013, that electronic cigarettes 'were not as inoffensive' as most manufacturers claim and 'emit certain components that are potentially carcinogenic'. The organisation criticized manufacturers for false labelling and stated that it had conducted tests which showed the presence of potentially harmful toxic and carcinogenic molecules in electronic cigarette vapor, including formol, acroleine, acetaldehyde, nickel, chrome, and antimoine. The organization called on the government to impose tighter regulations and labelling requirements on manufacturers. AFP PHOTO / THOMAS COEX (Photo credit should read THOMAS COEX/AFP/Getty Images)

Photo by THOMAS COEX/AFP/Getty Images

Writing in PLOS ONE, researchers noted that subjects seemed to gain weight even if their caloric intakes remained the same, but why?